Queensland, Qld, Australia

Main commodities: Zn Cu Pb Ag
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The Thalanga volcanic hosted massive sulphide deposit is located approximately 65 km south-west of Townsville of eastern Queensland in Australia (#Location = 20° 20'S, 145° 46'E).

Thalanga is the largest of a number of similar base metal massive sulphide bodies within the Cambro-Ordovician Mt Windsor Volcanics just to the south of Charters Towers in northern Queensland, Australia. The Mount Windsor volcanic and sedimentary sequence forms a 165 km long, by up to 10 km wide, east-west trending volcano-sedimentary belt from Ravenswood in the east to near Pentland in the west.   It has been extensively intruded by the Ordovician to Permian composite Ravenswood Batholith and Lolworth Igneous Complex along its northern margin, and is overlain to the south by the extensive Tertiary alluvials and ferricretes of the Campaspe Beds.

The Mt Windsor Volcanics belong the the Seventy Mile Range Group which commences with a 9 km thickness of Cambrian mixed volcanics and sediments dominated by continental-derived quartz and lithic rich sandstone, greywacke and siltstone.   These are overlain by the 300 to 3500 m thick Cambrian Mount Windsor Formation comprising a sequence of rhyolitic volcanics with minor dacite and rare andesite, while sediments are only found at the base.   The Mt Windsor Formation passes conformably upwards into the 500 to 4000 m thick Trooper Creek Formation made up of basaltic, andesitic, dacitic and rhyolitic lavas, intrusions and volcaniclastics, laminated siltstones and mudstones with local graptolites, calcareous meta-sediments, rare microbialites and thin iron stones.

The Thalanga deposit is hosted by rhyolitic lavas and volcaniclastics of the Mt Windsor Volcanics at or close to the their contact with dacites of the overlying Trooper Creek Formation, close to the Cambrian to Ordovician boundary.

The host sequence at Thalanga is composed of acid to intermediate volcanics and volcani-clastics. The immediate hosts are rhyolitic lavas and volcani-clastics, closely below a sequence of more intermediate composition. The main ore is composed of massive and semi-massive sulphides, and is underlain by disseminated and stringer mineralisation and minor stockworks.

The ore is represented by massive, banded and brecciated sulphides comprising sphalerite, pyrite, galena and chalcopyrite, with variable barite. The underlying disseminated and stringer mineralisation is composed of pyrite with associated chalcopyrite, sphalerite and galena.

The main ore lens dips steeply and pitches shallowly, outcropping as scattered gossan over a 550 m length and width of 6 to 22 m.

Barite is locally present in the massive to banded goethite-limonite gossan which was the surface expression of the deposit, exposed over a length og 550 m and average width of 6 m.   At least four bands and pod-like bodies of cherty quartz-magnetite are found at Thalanga West within the Trooper Creek Formation, while a few weak bands of quartz-magnetite occur within the altered footwall volcanics of the main Thalanga deposit.

The pre-mining resource was 6.35 Mt @ 12.3% Zn, 3.9% Pb, 99 g/t Ag, 2.2% Cu (Gregory, et al., 1990)

The most recent source geological information used to prepare this summary was dated: 1996.    
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd.   Unauthorised copying, reproduction, storage or dissemination prohibited.

  References & Additional Information
   Selected References:
Berry R F, Huston D L, Stolz A J, Hill A P, Beams S D, Kuronen U, Taube A  1992 - Stratigraphy, structure, and volcanic-hosted mineralization of the Mount Windsor Subprovince, North Queensland, Australia: in    Econ. Geol.   v87 pp 739-763
Bishop J R, Lewis R J G  1992 - Geophysical signatures of Australian volcanic-hosted massive sulfide deposits: in    Econ. Geol.   v87 pp 913-930
Gregory P W, Hartley J S, Willis K J A  1990 - Thalanga Zinc-Lead-Copper-Silver deposit: in Hughes F E (Ed.), 1990 Geology of the Mineral Deposits of Australia & Papua New Guinea The AusIMM, Melbourne   Mono 14, v2 pp 1527-1537
Hermann W, Hill A P  2001 - The origin of Chlorite-Tremolite-Carbonate rocks associated with the Thalanga volcanic-hosted massive Sulfide deposit, north Queensland, Australia: in    Econ. Geol.   v96 pp 1149-1173
Large R R  1992 - Australian volcanic-hosted massive sulfide deposits: features, styles, and genetic models: in    Econ. Geol.   v87 pp 471-510
Large R R, McPhie J, Gemmell J B, Herrmann W, Davidson G J  2001 - The spectrum of ore deposit types, volcanic environments, alteration halos, and related exploration vectors in submarine volcanic successions: some examples in Australia: in    Econ. Geol.   v96 pp 913-938
Miller C, Halley S, Green G, Jones M  2001 - Discovery of the West 45 volcanic-hosted massive sulfide deposit using Oxygen isotopes and REE geochemistry: in    Econ. Geol.   v96 pp 1227-1237
Paulick H and Franz G  2001 - Greenschist facies regional and contact metamorphism of the Thalanga volcanic-hosted massive sulfide deposit (northern Queensland, Australia): in    Mineralium Deposita   v36 pp 786-793
Paulick H, Herrmann W, Gemmell J B  2001 - Alteration of felsic volcanics hosting the Thalanga massive Sulfide deposit (northern Queensland, Australia) and geochemical proximity indicators to ore: in    Econ. Geol.   v96 pp 1175-1200

Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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